Last official estimated population of Kossuth County was 15,517 (year 2014)[1]. This was 0.005% of total US population and 0.5% of total Iowa state population. Area of Kossuth County is 974.3 mi² (=2523.5 km²), in this year population density was 15.93 p/mi². If population growth rate would be same as in period 2010-2014 (-0.04%/yr), Kossuth County population in 2026 would be 15,439 [0].
Historical population of Kossuth County for period 1860-2014 [1] , [2] , [3]:
Estimated population for 2014[1]. Population density is in p./sq.mi [4]. Changes are for period 2010-2015. Value is %/year. Boundary lines are approx. 2012 [5]. Click on flag to hide it.
Population • Density • Changes • Legends • Position

[1860-1870] +23.2 %/yr
[1870-1880] +6.31 %/yr
[1880-1890] +7.82 %/yr
[1890-1900] +5.64 %/yr
[1900-1910] -0.33 %/yr
[1910-1920] +1.33 %/yr
[1920-1930] +0.15 %/yr
[1930-1940] +0.45 %/yr
[1940-1950] -0.15 %/yr
[1950-1960] -0.36 %/yr
[1960-1970] -0.98 %/yr
[1970-1980] -0.47 %/yr
[1980-1990] -1.62 %/yr
[1990-2000] -0.8 %/yr
[2000-2005] -1.04 %/yr
[2005-2010] -0.93 %/yr
[2010-2014] -0.04 %/yr
Looking for settlements in Kossuth County? Visit this page: Settlements in Kossuth County, IA
Population of Kossuth County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 471 | 371 | 842 |
| 5 to 9 | 511 | 429 | 940 |
| 10 to 14 | 462 | 490 | 952 |
| 15 to 19 | 486 | 457 | 943 |
| 20 to 24 | 387 | 382 | 769 |
| 25 to 29 | 375 | 325 | 700 |
| 30 to 34 | 408 | 394 | 802 |
| 35 to 39 | 370 | 352 | 722 |
| 40 to 44 | 371 | 350 | 721 |
| 45 to 49 | 420 | 440 | 860 |
| 50 to 54 | 617 | 557 | 1,174 |
| 55 to 59 | 683 | 621 | 1,304 |
| 60 to 64 | 548 | 523 | 1,071 |
| 65 to 69 | 423 | 433 | 856 |
| 70 to 74 | 305 | 387 | 692 |
| 75 to 79 | 336 | 372 | 708 |
| 80 to 84 | 232 | 292 | 524 |
| 85+ | 242 | 400 | 642 |
Kossuth County resident population estimates by Sex, Race, and Hispanic Origin[1b]. For full list of abbrevations see: population.us/about page.
| Race | Male | Female | Total |
| WAC | 7533 | 7463 | 14,996 |
| NH | 7499 | 7423 | 14,922 |
| WA | 7468 | 7406 | 14,874 |
| NHWAC | 7409 | 7331 | 14,740 |
| NHWA | 7349 | 7281 | 14,630 |
| H | 148 | 152 | 300 |
| HWAC | 124 | 132 | 256 |
| HWA | 119 | 125 | 244 |
| BAC | 90 | 62 | 152 |
| NHBAC | 86 | 58 | 144 |
| TOM | 68 | 58 | 126 |
| NHTOM | 63 | 51 | 114 |
| AAC | 46 | 60 | 106 |
| NHAAC | 46 | 58 | 104 |
| BA | 54 | 36 | 90 |
| IAC | 42 | 46 | 88 |
| NHBA | 52 | 35 | 87 |
| AA | 30 | 48 | 78 |
| NHAA | 30 | 48 | 78 |
| IA | 23 | 25 | 48 |
| NHIAC | 21 | 27 | 48 |
| HIAC | 21 | 19 | 40 |
| HIA | 18 | 17 | 35 |
| NHIA | 5 | 8 | 13 |
| HTOM | 5 | 7 | 12 |
| NAC | 5 | 3 | 8 |
| HBAC | 4 | 4 | 8 |
| HNAC | 5 | 2 | 7 |
| HNA | 4 | 2 | 6 |
| NA | 4 | 2 | 6 |
| HBA | 2 | 1 | 3 |
| HAAC | 0 | 2 | 2 |
| NHNAC | 0 | 1 | 1 |
| NHNA | 0 | 0 | 0 |
| HAA | 0 | 0 | 0 |
• Martin County population
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40.5 mi,
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[0] Calculated by population.us from last known population growth rate, not official data.
[1] County population - 2014, archived from the original, retrieved 02/23/2016
[1b] Annual County Resident Population Estimates by Age, Sex, Race, and Hispanic Origin, (used only data for 2014) archived from the original, retrieved 02/23/2016
[2] County population - 2000-2010, archived from the original, retrieved 02/23/2016
[3] Population of States and Counties of the United States: 1790 to 1992, PDF, 15 Mb, census.gov, retrieved 02/23/2016
[4] County area, latitude longitude data, retrieved 02/23/2016
[5] County boundaries, CSV files on boundaries.us, retrived 03/18/2016
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